Move more stuff to docs/

Author: Shillaker

docs/containers.md

@@ -0,0 +1,42 @@
+# Managing containers
+
+>**Requirements:**
+- You have [created a Container Registry namespace](https://www.scaleway.com/en/docs/compute/container-registry/how-to/create-namespace/)
+- You have installed Docker and can build and push your image to your registry.
+
+To manage your containers, you must first define them in the `custom.containers` field in your `serverless.yml` configuration file.
+
+Each container must specify the relative path of its application directory (containing the Dockerfile, and all files related to the application to deploy):
+
+```yml
+custom:
+  containers:
+    mycontainer:
+      directory: my-container-directory
+      # port: 8080
+      # Environment only available in this container
+      env:
+        MY_VARIABLE: "my-value"
+```
+
+Below is an example of the files you should have in your application directory. The directory that contains your Dockerfile and scripts is called `my-container-directory`.
+
+```
+.
+├── my-container-directory
+│   ├── Dockerfile
+│   ├── requirements.txt
+│   ├── server.py
+│   └── (...)
+├── node_modules
+│   ├── serverless-scaleway-functions
+│   └── (...)
+├── package-lock.json
+├── package.json
+└── serverless.yml
+```
+
+Scaleway's platform will automatically inject a PORT environment variable on which your server should be listening for incoming traffic. By default, this PORT is 8080. You can change the `port` in the `serverless.yml` file.
+
+You can use the container example provided on this [documentation page](https://github.com/scaleway/serverless-scaleway-functions/tree/master/examples/container) to get started.
+